answer three questions in short answers

1-Please compare and contrast the major types of random sampling and non-random sampling. Why is random sampling the preferred method of getting a sample?

2- Explain the benefits and drawbacks to cross-sectional and longitudinal designs.

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3-Explain why we need to operationalize (i.e., create operational definitions) for seemingly abstract concepts in the social sciences. Pick a social science variable (e.g., aggression, love, happiness) and operationalize it for a hypothetical study.